Any hashrate increase? Like for 1.5.8. when you didn´t say anything and my vegas hashed like 200 more per rig, what a nice surprise 
So you getting about 2200h now or more?
https://www.reddit.com/r/stellite/comments/8p1tss/v4_mandatory_update_for_all_node_maintainers_of/ - stellite too
1.5.8 shouldnt be faster than 1.5.9, cause nothing was changed that could impact speed. Placebo
unbelievable but true. my RX 550 2gb at 1.5.8 gave out stably 6590 hashes at setting 26/8/2, and on 1.5.9 neither as more than 6510 hashes
what happens on 27/8/2?
in this case, everything is not stable, or the cards do not start all at once, but only after a couple of reboots and after that in a couple of hours all the same 0 the hashes are shown and the reboot is going on. But on the other hand, the speed on version 1.5.8 strongly diverged by the indications on the pool, and 1.5.9 shows approximately equal values with the pool. So we stay on 1.5.9
I think 6500 with 13 RX 550 cards is a good result, the main thing is that there would be stability.Thank you for the miner.